Vahlenkamp, Maximilian; D'haenens, Simon; De Vleeschouwer, David; Hull, Pincelli M; Zachos, James C; Agnini, Claudia; Pälike, Heiko (2026): Middle Eocene astronomically-tuned benthic stable isotopes, bulk stable isotopes and Ca/Fe-ratios of IODP Expedition 342 Sites U1408 and U1410 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.928159
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Published: 2026-01-28 • DOI registered: 2026-02-26
Abstract:
To come to a coherent middle Eocene timescale for the Atlantic, we re-evaluate the astrochronology of chrons C20n/C20r at International Ocean Discovery Program (IODP) Expedition 342 Sites U1408 and U1410 off Newfoundland. Based on the stratigraphic work of Cappelli et al., 2019 a two-site-composite for the chrons C20n and C20r (~42-46 Ma) was constructed by transferring U1410 samples to the U1408 depth-scale. We then used previously published (U1410; Vahlenkamp et al., 2018) and new (U1408) benthic and bulk stable isotopes (d^13^C and d^18^O) to derive a revised eccentricity-tuned astrochronology for the Expedition 342 composite. The astrochronologic tuning demonstrates that the contourite deposition (reflected by the Ca/Fe ratio) at the Newfoundland Ridge occurred under an amplified climatic response to obliquity during C20n and C20r – with intermittent "astronomical flickering" to precession. To further test our astrochronology we refined nannofossil datums at Site 1263 to compare with those at Site U1410 (Cappelli et al., 2019). The new chronology synchronizes time scales across the Atlantic basin. A robust middle Eocene chronology for the North Atlantic is indispensable because Expedition 342 sites host the highest-resolution middle Eocene benthic stable isotope records for this time interval.
Project(s):
Coverage:
Median Latitude: 31.403721 * Median Longitude: -42.059914 * South-bound Latitude: -28.532830 * West-bound Longitude: -49.785805 * North-bound Latitude: 41.438315 * East-bound Longitude: 2.779480
Date/Time Start: 2003-03-29T15:15:00 * Date/Time End: 2003-04-03T13:30:00
Comment:
This dataset has been carefully reviewed and curated in accordance with PANGAEA's exceptionally high quality standards. However, due to discontinued communication from the authors' side, it did not receive the usual formal approval by the authors and therefore lacks final scientific validation.
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
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7 datasets
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Datasets listed in this bundled publication
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Nannofossil datums refined of ODP Sites 208-1263. https://doi.org/10.1594/PANGAEA.928123
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Age depth tiepoints of IODP Site 342-U1408 and 342-U1410. https://doi.org/10.1594/PANGAEA.928124
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Benthic isotopes of IODP Site 432-U1408 and Site 342-U1410. https://doi.org/10.1594/PANGAEA.928125
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Bulk stable isotopes of IODP Site 342-U1408. https://doi.org/10.1594/PANGAEA.928141
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Ca/Fe-ratios of IODP Sites 342-U1408 and 342-U1410. https://doi.org/10.1594/PANGAEA.928151
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Benthic stable isotopes and bulk stable isotopes raw data of IODP Site 342-U1408. https://doi.org/10.1594/PANGAEA.928243
- Vahlenkamp, M; D'haenens, S; De Vleeschouwer, D et al. (2026): Chronozones of IODP Site 342-U1410. https://doi.org/10.1594/PANGAEA.928242